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2012 SUMMER INSTITUTE DISCLAIMER: This presentation was prepared using draft rules. There may be some changes in the final copy of the rules. The rules for this event that are in the current year’s Coaches Manual and Student manuals will be the official event rules.

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2013 Event Description In Dynamic Planet, students will use science process skills to complete tasks related to glaciation and long term climate change

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What Students Will Do: Students will be presented with one or more tasks using science process skills including: Analysis and interpretation of erosional and depositional landforms created by glaciers Analysis of geologic maps that include glacial deposits to determine the sequence of events over episodes of glacial advance and retreat Interpretation of oxygen isotope data from a sediment core to identify changes in sea level caused by glacial advances and retreat

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Activity One: Make Your Own Glacier In this activity, you will get directions to create and you will observe a melting glacier.

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What is a Glacier? A glacier is a thick mass of ice that forms over hundreds or even thousands of years…

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What is a Glacier? Snow- and lots of it is the raw material from which glacial ice originates… Over time, the snow compacts into granular or hardened snow

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What is a Glacier? This granular snow then recrystallizes to form firn- an intermediate stage between snow and ice

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What is a Glacier? Over time, the firn continues to compact and recrystallize into glacial ice Firn is often found underneath the snow that accumulates at the head of the glacier

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Make Your Own Glacier Now… let’s make our own glacier First, take a mixture of dirt and rocks of various sizes. Add approximately 1 tablespoon of the mixture per ice cube that you will make. Add water and freeze the mixture overnight

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Make Your Own Glacier Take the ice cube (aka the glacier) and turn it upside down onto the surface Next, give the glacier a push forward. You might also push it down slightly into the surface.

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Make Your Own Glacier Make observations as the ice cube is melting.. What is happening to the pebbles, dirt and rocks that were in the glacier?

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Make Your Own Glacier The piles of dirt could be moraines that are left at the end of a glacial advance

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Make Your Own Glacier You might also see large boulders or erratics that appear out of place in comparison to other sediments left by the glacial retreat

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Make Your Own Glacier There could also be basins that filled with meltwaters when the glacier retreated. These are kettles or kettle lakes.

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2013 Event Topics: The 2013 Dynamic Planet Event will emphasize the following three key topic areas: Glaciers in the hydrologic cycle, impacts on climate, streams, lakes and oceans Pleistocene and pre-Pleistocene glacial history Theories explaining glacial and ice sheet advance Glaciers as indicators of modern global climate change

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Forms of Glaciers Alpine glaciers are masses of glacial ice that accumulate in mountainous uplands and plateaus…

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Forms of Glaciers Continental glaciers are enormous ice sheets that flow out from one or more centers to completely cover all but the highest areas of underlying terrain…

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Erosional Landforms The forward motion of a glacier is known as its ‘flow’…

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Erosional Landforms In the process of moving forward, glaciers pick up enormous amounts of debris as they loosen, break off and incorporate pieces and blocks of rock into the ice… This is a process known as ‘plucking…’

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Erosional Landforms This embedded material may create long scratches or grooves called ‘glacial striations’ as the glacier moves forward acting like a giant rasp as it moves across the rock…

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Erosional Landforms The pulverized rock that results from abrasion is called ‘rock flour…’

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Depositional Landforms ‘Moraines’ are large deposits of glacial till that form a variety of depositional features…

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Depositional Landforms ‘Lateral Moraines’ are ridge like piles of till that accumulate along the sides of valley glaciers…

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Depositional Landforms ‘Medial Moraines’ form where adjacent lateral moraines merge into a single long ridge of till…

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Depositional Landforms ‘End Moraines’ form where the terminus or end point of an active glacier remains at the same location for a number of years piling up into an increasingly larger ridge or hill…

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Activity Two: Identifying Glacial Features on Topographic Maps In this activity, you will identify landforms associated with glaciers on a topographic map. You will need the Hyannis, Massachusetts, Marmot Mountain, Montana, and Palmyra, New York topographic map pages to complete the activity.

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Identifying Glacial Features on a Topographic Map: Describe the topography of the map indicated by the red X shown on the screen? What term related to glaciers can be used to describe this topography? Hyannis, Massachusetts X

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Identifying Glacial Features on a Topographic Map: Read the contour lines surrounding the four ‘Bs’ in the northern half of the map. What type of glacial landforms are they likely to be? What category of glacial landforms are the four ‘Bs?’ Hyannis, Massachusetts

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Identifying Glacial Features on a Topographic Map: Read the contour lines surrounding areas labeled D in the southern half of the map. What category of glacial landforms are the D Regions of the map? Hyannis, Massachusetts

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Identifying Glacial Features on a Topographic Map: What might account for the swampland in the NW/North Central region of the map? Hyannis, Massachusetts

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Identifying Glacial Features on a Topographic Map: What type of glacial landform likely is indicated by C, O and M? Marmot Mountain, Montana

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Identifying Glacial Features on a Topographic Map: What type of glacial landform likely is indicated by N? Marmot Mountain, Montana

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Identifying Glacial Features on a Topographic Map: What type of glacial landform likely is indicated by B and E? Palmyra, New York

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Identifying Glacial Features on a Topographic Map: What might explain the linear movement of streams F and G in the SW corner of the map? Palmyra, New York